It's typical and forgettable in the same way that Tolkien is typical of fantasy literature. Utterly typical, because it couldn't be a benchmark if it wasn't typical.
There are, I think, some pretty atypical nuances to squadron leader, but you have to damn near dedicate a pipe to it to find them. First, it's both sweeter and heavier on orientals than many "typical" english mixtures. Kind of like if Frog Morton had some balls. Second, there's a real faint trace of some kind of almost floral essence. The first time I tasted it I thought it was maybe a ghost from some aromatic or other, but no, if you hunt for it and think about it, there is a very gentle caress of "lakeland essence" in it which offers the palate a bit of a break from the darker latakia flavors.
Overall, the balance is harmonious. You can taste the component tobaccos, but nothing is overwhelming. It's a blend in the deepest meaning of the word.
If a guy reads a lot of fantasy, and reads current authors like George Martin or even Gemmel, if you go back and read "the blueprint", ie, Lord of the Rings, it seems trite, contrived, and a little childish. The newer authors are "more developed" in the craft, but the craft only exists because of the pioneering done by Tolkien.
Bring it back to tobacco. How long has squadron leader been on the market? Perhaps it has been "surpassed" by the great Pease blends or some other.... it matters not. The benchmark is the benchmark, and we can only find it plain because so many others are trying to be like it.